Valve foe percussion book drills



(No Model.) 5 sheets-sheen 1.

' A. W. 8u Z. W. DAW.

VALVE FOR PBRGUS 10N RocK DRILLS.

Pmmntfa` Dec. 25, 1894.

5 Sheets-Sheet 2.

(No Model.)

A. W. 8v Z. W. DAW. VALVE FOR PERoUssIoN Roux DRILLS.

PatentedDec. 25.11894.

Wfnesse's:

(Nro Model.)

' 5 sheets-sheen 3. A. W. 8vv Z.W.'DAW. VALVE FOR PERCUSSION ROGKDRILLS.-

No. 531,587. y Patented Dec.v 25, 1894.

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flo'model.) 5 Sheets-#Sheet 4...

\ A. W. 8v Z. W. DAW.

VALVE FOR PERGUSSION ROGKDRILLS. No. 531,587.v Patented Dec. 2 5, 11894.

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VALVE PoR PERCUSSION 1100K DRILLS. No. 531,587., Patented Deci 25,1894.v

l!!! xm* Q/ Wilnesses: jfnvenors:

' UNITED STATES ALBERT WILLIAMS DAW AND PATENT OFFICE.

ZACHARIAS WILLIAMS DAW, OF LONDON,

ENGLAND.

VALVE FOR PERCUSSION ROCK-DRILLS.

SPECIFICATION forming part of Letters' Patent No. S31/,587, datedDecember 25,1 894.

Application met Apru 13, 1894. serai No. 507,386. (No mais.) Patented inEngland June 13,1893, No- 11.607-

vTo all whom #may concern:

vented certain new and useful Improvements in and connected with Valvesfor Percussive Rock-Drills, and Direct-Acting Pumps and Engines, (forwhich We have obtained a Brit-v ish patent, No. 11,607, dated June 13,1893,) of

which the following is a specification.

The present invention relates to the ern-v ployment of an auxiliaryvalve for controlling the exhaust of the pistons which actuate the` mainvalve for governing the supply and exhaust passages for actuating themain piston of reciprocating engines, such auxiliary valvey being itselfactuated by passages controlled by the main piston. For this purpose anauxiliary valvegis arranged to work in a cylinder the opposite ends ofwhich are connected by passages leading to near the opposite ends of thecylinder in which the piston of the reciprocating engine works, andwhich piston in its to and fro movements opens and closes such passages,so that when one side of such main piston is open to exhaust, thecorresponding end of the auxiliaryvalve cylinder is also open toexhaust, While the opposite end of the auxiliary valve.cylinder isthrough the other passage open to the supply which is then acting on theopposite side of the main piston. The auxiliary valve is thus shot overfrom one end ofits cylinder to the other, and

in its movement shuts a passage leading to one end of the cylinder inwhich the main valve worksLwhile it opens a second passage leading tothe opposite end of the main valve cylinder to the main exhaust. Y

The construction of the main valve and the arrangement of the ports orpassages for actuating same may be similar to that set forth in thespecification of our prior United States Patent No. 456,801, dated July28, 1891, but the passages connecting the ends of the main valvecylinder with the passages leading to the ends of the main pistoncylinder will not be necessary, as the connection with the exhaust inthe present arrangement will be effected through the auxiliary valvecylinder. It will however be readily understood that the main valve maybe constructed and actuated in any other suitable manner instead of thatdescribed in the specification of such prior patent.

In the accompanying drawings Figure 1 is a longitudinal vertical sectionthrough the auxiliary valve and main cylinder of a reciprocating engine,taken onthe lineas, x, Fig. 4. Fig. 2 is a central longitudinalvertiealsection through the main valve and main cylinder of such engine, themain valve being arranged` and actuated in the manner set forth in thespecification of our prior patent above referred to. Fig. 3 is a planview of the face of the main cylinder. Fig. at is a transverse sectionthrough the auxiliary and main valves and the main cylinder, and Fig. 5a horizontal section through the auxiliary and main valves.

passage, C or C', be open to the supply which is then acting on theopposite side of the main piston E, as soon as the latter in its traveluncovers such passage, and the auxiliary valve A will consequently beshot over from one end of its cylinder B to the other.

As will be seen in Fig. 1, the auxiliary valve A is formed with anannular groove A `in its center, While ports F, F', are formed in itscylinder B and lead respectively to the opposite ends of the main valvecylinder G, in -which works the main valve H for controlling the supplyand exhaust to the main cylinder D in which the main piston Ereciprocates. (See Figs. 2 and 5.) The auxiliary valve cylinder B hasalso another passage I leading to theexhaust passage J, and the movementof valve A in its cylinder B alternately connects IOO such passage Iwith one or other of the passages F, F, leading respectively to theopposite ends of the main valve cylinder G, which is consequentlybrought open to exhaust.

In the drawings the main valve H is shown as being actuated by themovement of the main piston E controlling a port or passage K leadingfrom near the center of the main piston cylinder D to near the oppositeends of the main Valve cylinder G, as shown by dotted lines in Fig. 2and also shown in plan in Fig. 3, so that steam from that side of thepiston E which is being acted upon, is at a certain point in its traveladmitted to one end of the main valve cylinder (the end of the passage Kleading to the opposite end of such main valve cylinder being at thattime closed by the main Valve H) and the main valve is consequently shotover in its cylinder and reverses the connection between the oppositesides of main piston E with steam and exhaust respectively, through thepassages L, M andexhaust J in the well known manner. It will however bereadily understood that such main valve II may be actuated in any othersuitable manner t0 that described.

What we claim as our invention, and desire to secure by Letters Patent,is-

1. In a reciprocating engine, the combination of a cylinder having apiston therein, a main Valve cylinder, having a valve therein, and anauxiliary valve cylinder, also having a valve therein, supply ductsleading from near the opposite ends of said piston cylinder to theopposite ends of said auxiliary valve cylinder, said ducts beingcontrolled by said piston, supply duets also leading from said pistoncylinder to near the opposite ends of said main valve cylinder and beingcontrolled by said piston, exhaust ducts leading from the ends of saidmain valve cylinder t0 the auxiliary valve cylinder, a main exhaust ductfor said engine, and apassage connecting said main exhaust duct withsaid auxiliary valve cylinder, said main exhaust passage and said mainvalve exhaust ducts being controlled by said auxiliary valve,substantially as described.

2. The combination with the main valve of reciprocating engines, of anauxiliary valve having passages leading from the opposite ends of thecylinder in which such auxiliary valve works, respectively, to near theopposite ends of the main cylinder' in which the main piston works, andwhich passages are controlled by the movement of the piston, themovement of such auxiliary valve controlling other passages leadingrespectively to the opposite ends of the cylinder in which the mainvalve Works so as to place such ends alternately in connection with anexhaust passage through the ports of the main cylinder and through themain valve to the main exhaust, While the supply to the opposite ends ofthe main valve is controlled directly by the movement of the main pistonthrough passages leading from the two ends of the main valve cylinder tothe main piston cylinder, substantially as described.

ALBERT WILLIAMS DAW. ZACHARIAS WILLIAMS DA'W.

Witnesses to the signature of the abovenamed Albert Williams Daw: J oNAsHILAND, I. RINAAS. Witnesses to the signature of the abovenamedZacharias Williams Daw:

HARRY A. MCLRLLAN, H. J. FERRY.

